Battery charger



FIG. 1 is a right, front, top view of a first embodiment of a battery charger, showing our new design;

FIG. 2 is a top elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a bottom elevation view thereof; and,

FIG. 7 is a right side elevation view thereof.

The broken lines shown in FIGS. 1-7 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a battery charger, as shown and described. 